Automatic controll for air-compressors.



W. L. PIGKETT.

AUTOMATIJ CONTROL FOR AIR COMPRESSOES.

APPLICATION FILED MAR. 26, 1912.

1 52,619, Patented Feb. 11, 1913.

WITNESSES. lil 'i E/VTOR v fibf zwr Kw. cwfizaj. f

35 ing an arrangement of the parts, which to To all whom it may concerns WILLIAM L. PICKE'I'T, OF BRIDGEPORT, CONNECTICUT.

A'UEOMATIC CONTROL FOR AIE-COMPBESSO.

Specification 01' Letters Patent. Patented Feb, 11, 1913.-

' Application filed March'26, 1912. Serial 1%.,886374.

Be it known that I, WILLIAM L. PICKEIT, a citizen of the United States, residing at Bridgeport, county 'of Fairfield, State of Connecticut, have invented anImprovemen-t in Automatic Control for Air-Compressors, of which the following is a specification.

This invention relates to the class of air compressors which operate by water pres:

sure and are adapted for general use as for providing light power for any purpose whatever, for use in connection with atomizers andother appliances in sur eons, physicians" and dentists oifices an with beer drawing apparatus in saloons; and the in-- vention has for its object to provide an automatic control which will effect an important saving in the consumption of water and will retainthe pressure in the storage tank between a predetermined maximum and, mimmum pressure, the structure as a whole being relatively inexpensive to produce and so constructed that there will be little or no wear, the parts being quick acting, always ready to work and practically impossible to get out of repair.

With these and other objects in View, I

have devised the novel automatic controlling mechanism which I will now describe referring to the accompanying drawin forming a part of this specification an using reference characters to indicate the several parts.

The single figure of the drawing'is adiagrammatic view, partly in section, illustratgether comprise the control, and'their operation in use. I i I 10 denotes a hydraulic air compressor, 11 a water supply pipe provided with a valve 12, 18a storage tank which receives air from the compressor by a pipe 14, 15 a water tank from which a waste pipe 16 leads, 17 an air cylinder, &8 a piston therein, 19 a rod extending from the piston and through one head of the cylinder, 20 an air pipe leading from the storage tank to the cylinder and provided with an escape valve 21, 22 a pressure gage, 23 an electromagnet and-24 an electric circuit including a battery, the pressure gage and the electromagnet.

Assoon as the compressor is started, air will begin to accumulate in the storage tank.

When the pressure reaches its predetermined maximumsay, forexample, twenty pounds, a pop safety valve 25 upon the storage tank will be opened and. air will pass through plpe 20 to cylinder 17 and will raise the iston and rod 19 more or less. As soon as t e excess of pressure is relieved, thev reaches the predetermined maximum, the safety valve will again open and permit air to pass to the cylinder and the piston willbe again raised. 26 denotes another rod in the present instance shown as U-sha ed, which rests upon rod 19 and is retain in place by guides 27. One arm of rod 26 is ressure in the stor- As'soon' as the pressure in the storage tank again pivoted to a lever 28 fulcrum ed in tank 15' and carryin at its other end a pivoted stop- P P per 29 whic is adapted to close waste 16. Rod 26 also carries a catch 30 which is trol ed hook 31 forming part of electromag net 23. After the necessarynumber of actuations' (the number depending, of course,

on various conditions) the piston and rod 19 will be carried high catch 30 in engagement with hook 31. Practically simultaneously with the engagement-of catch 30 by the hook, an arm 32 extendin from red 26 will engage a plunger ve extending through the case of escape va 21vand will open said valve which will permit the air to escape from the cylinder and the piston to drop, leaving the catch in engagement with the hook and rod 26 and adapted to be engaged by a spring 0011- enough to place lever 28 in the position indicated by dotted lines, the stopper now closing Waste pipe 16.

During the time that air has been accumulating in the storage tank and prior to the engagement of catch 30' by the hook and the closing of waste pipe 16 by thestofx; per, water'will have been passing from t compressor to tank 15 through a pipe 33 and water will have been passing from the tank through thewaste pipe. The water supply,

may be either ordinary service pressure or pressure from, a tank, as mom convenient.

Water valve 12 in thesupply pipe is of a type that will normally be held open either by the pressure of the water or by spring pressure. The closing of waste pipe 16 has it will raise'afloat indicated by dotted already with water.- As thewater' rises in the tank upper'arm of a lever is carried until said arm is caused to engage a plunger thereby shutting the compressor and stopping its action. The arts will remain in the position just described, the float being in the raised position sor not working until the electric circuit 1s v lever 28 raisin closed, the eiiect of-which is to energize the electromagn'et and disengage hook 31 from catch on rod 26. TlllS permits the rod to drop to the full line position and tilts the stopper and allowing the water to rain from tank "15, which causes the float to fall of the upper armof 36 in valve 12. The valve wil now open and emit-water to pass to the compressor starting it into operation again.

- ing with energize the electromagnet and release rod 26, which will cause the tank to be drained and the water" valve op compressor into operation again. thus be seen that when the storage tank has;

It will been "char ed to the maximum pressure and catchi30 as been engaged by the hook-oi? the electromagnet, the compressor, will storage f tank jincommunication therewith v stopped and will not be, started againuntil the storage tank-'has-been reduced to, the predetermined minimurm.

the pressure in Having "thus-..describedi my invention I cla'imr'j z 1 automatic control of the character described comprising an air compressor, a

[and provided with an outlet, a cylinder in communication with said tank, means independent of. said I outlet for intermittently permitting the passage of fluid under pres sure from said tank tosaid cylinder when the; pressure in said 'tankexceeds a predetermmedpoint, a piston in said cylinder trolling means w ,and operated by said fluid pressure, meansfor controlling said compressor, means actuated by said piston to operate said conto stop the compressor, and means for permitting said piston to return to its normal position irrespective of said fluid pressure.

described. As the compressor ,is still in operation, tank 15 will now .fill.

therein and swing the" 35 by which the float 36 in valve 12 and close said valve, j

ofi' the supply of waterto lines, andthe compresrelieving the pressurelever 35 u on plunger -the pressure gage,

ened to start;- the means, outlet .by said governor,

] and means the compressor,

communication with said tank, means indes pendent of ton said cylinder and operated bysaid means for controlling said: compressor, means actuated by said piston to fluid pressure,

operate said controlling means to stop 'the compressor, means operation of saidcontrolling means after being actuated by said piston, and means for permitting said piston to return to its 'normal position irrespective. of said fluid pressure. v

,2. automatic control of the character described; comprising an air compressor, a

storage tank. in. communication therewith "i: v and provided withfan outlet, a cylinder in, A I

said outlet for intermittently' permitting the passage of fluid urideriprs T sure from said tank; to said cylinder, aipis- Y for preventing further I it 3. An apparatus of I the character" described comprising an air compressor, a storage tank having adischarge outlet and a I pressure gage, mechanism for controlling the compressor,- an electromagnet in circuit with a cylinder, a safety valve independent of saidi outlet forintermittently permitting passage "of .fluid under pressurev from said tank to said cylinder, a piston in' said cylinder operated" by said fluid pressure, a rod actuated bythe piston and con nected with "said controlling mechanism,

, means controlled by, said magnet for locking saidrod'out of'operative position, meansat the pressure gag for controlling the circuit i for "permitting p to said magnet, and means saidpiston to return to its normal position; irrespective of said fluid pressure.

4. An, automatic control'of thecharacter discharge outlet, means for contro ling the compressor, a governor for said controlling an electromagnet provided with means for preventing further operation of said controlling means after being actuated means connected with said pressure ga e for controlling said magnet, or restoring said governor to its the same,

described comprising an air compressor, astorage tank having a pressure gage and a means independent ofsaid discharge for intermittently admitting pressure ,I'rom the tank to said governor to operate r ins normal position irrespective of the pressure in said tank.

5. An automatic control of the character.

described comprising an air compressor, a storage tank in communication therewith and provided with an outlet, a cylinder in communication with said tank, means independent of said outlet for intermittently permitting the passage of fluid under pressure from said tank to said cylinder, a piston in said cylinder and operated by said fluid pressure, means for controlling said compressor, means actuated by said piston to operate said controlling means to stop an electromagnet provided with means for preventing further operation of said controlling means after being actuated by said piston, a pressure gage for said tank, means connected with said pressure gage for controlling said magnet, and means for permitting said piston to return to its normal position irrespective of said fluid pressure.

6. An automatic control of the character described comprising an air compressor, a storage tank in communication therewith and provided with-an outlet, a cylinder in communication with said tank, means independent of said outlet for intermittently permitting thepassage of fluid under pres- Sure from said tank to said cylinder, a piston in said cylinder and operated by said fluid pressure, means for controlling said compressor, means actuated by said piston to operate said controlling means to stop the compressor, an electromagnet, a spring pressed detent controlled by said magnet, means connected with said controlling means for engaging said. detent, and a pres sure gage connected with .said tank and provided with means for controlling said magnet, and means for permitting said piston to return to its normal position irrespective of said fluid pressure.

7 An automatic control of the character described comprising an air compressor, a storage tank in communication therewith, a cylinder in communication with said tank, means for automatically controlling the passage of fluid under pressure from said tank to said cylinder, a piston in said cylinder, means for controlling said compressor,

means actuated by said piston to operate said controlling means to stop the compress'or, said operating means including a rod provided with a detent, an exhaust valve controlling the pressure in said cylinder, said rod being provided with means for actuating said valve, an electromagnet provided with means for engaging said detent, and a pressure gage connected with said tank and provided with means for controlling said magnet.

8. An automatic control of the character described comprising an air compressor, a storage tank in communication therewith and provided with an outlet, a cylinder in communication with said tank, means independent of said outlet for intermittently permitting the passage of fluid under pressure from said tank to said cylinder, a piston in said cylinder and operated by said fluid pressure, means for controlling said compressor, means actuated by said piston to operate said controlling meansto stop the compressor, means for preventing further operation of said controlling means after being actuated by said piston, and means for permitting the piston to assume its normal position after the operation of the com- 'pressor has been arrested irrespective of the pressure in said tank.

in presence of two witnesses.

WILLIAM L. PICKETT.

Witnesses:

S. W. ATHERTON, M. L. HAGGEMAN.

In testimony whereof I aifix my signature 

